Angular distributions in dibaryon resonance decays

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Date

1989-04

Author

Langen, Trevor J.

Type

Thesis

Degree Level

Masters

Abstract

In Chapter 1, a literature review is carried out examining the
different aspects of dibaryon resonances. Different reaction channels
are investigated for claims substantiating the existence of these
structures. These claims, however, can also be explained using conventional
NNÏ€ and NÎ” physics without the need for conjecturing internal
degrees of freedoms (quarks) found in various bag models. Evidence for
the existence of narrow resonant structures is given and compared to
theoretical model dependent predictions.
Experimental considerations are examined in Chapter 2 such as probe,
spectrometer and reaction channel to be used. Various techniques are
employed to minimize non-resonant background. A multi-particle Ï€(sterad)
detector is described which will be used to measure simultaneous angular
distributions on and off the resonance energy. Finally, the physical
region accessible to this detector is found.
The calculation of angular distributions for a resonant state of
different spin-parity is shown in Chapter 3. The calculation is a
simplified treatment of the 3-body resonance decay problem in an effort
to distinguish among these different angular distributions for a resonance
of pure spin-parity state. The angular distribution measurement
will substantiate the claim either for the existence of dibaryonic
resonances or to the contrary. As well, spin assignment is conceivable,
which will act as a stringent test for the conventional and various quark
theories.
In Chapter 4, the results are shown for both the pion rest frame and
lab frame. The sensitivity for separation is found and converted to the
number of running hours.
Chapter 5, is the conclusion.